CARAPACE ANGLES

In Leaiidae (Conchostraca), angle made by straight dorsal margin with anterior rib (a) and with posterior rib (b); these angles may have utility in tracing evolutionary development and in stratigraphic zonation [Moore and McCormick, 1969].

Intersection of straight and dorsal margin by anterior rib (alpha) and posterior rib (beta) [McLaughlin, 1980].

(ARTHROPODA: Crustacea)

In Conchostraca, the intersection of the straight dorsal margin by the anterior and posterior ribs.